Selective or printing telegraph



c. L. AND H. L. KR UM. SELECTIVE 0R PRINTING TELEGRAPH.

APPLICATION FILED MAY 17. 1915- Patented Jan. 25, 1921.,

4 SHEETSSHEET 1.

C. L. AND H. L. KRUM.

SELECTIVE 0R PRINTING TELEGRAPH.

APPLICATION FILED MAY 1.7. 1915.

1 3 6 6, 8 1 2 Patented Jan. 25, 1921.

4 SHEETS-SHEET 2.

m X m wM/x M C. L. AND H. L. KRUM.

SELECTIVE 0R PRINTING TELEGRAPH. APPLICATION FILED MAY 17. 1915.

1,366,812. Patented Ja11.-25',1921.

4 SHEETSSHEET 3.

C. L. AND-H. L. KRUIVI.

SELECTIVE OR PRINTING TELEGRAPH.

APPLICATION FILED MAY I7. I9I5- Patented J31]. 25, 1921..

4 SHEETSSHEET 4.

. 0060 0 OO 0 OOO o 000 MWAW QO UNITED STATES PATENT OFFICE.

CHARLES L. KR'O'LI AND HOWARD L. KRUM, OF CHICAGO, ILLINOIS, ASSIGNORS TO.

MORKRUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

SELECTIVE OR PRINTING TELEGRAPH.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed May 17, 1915. Serial No. 28,699.

certain new and useful Improvements in Selective or Printing Telegraphs, of which the following is a full, clear, and exact description.

The invention relates to selective or print-v ing telegraphs in which the characters or signals are represented by combinations of impulses, and in which the transmission of the signals or combinations of impulses is controlled by the formation of a tape.

The present invention seeks to provide means whereby the tape can be fed directly from the tape-forming or punching mechanism to the transmitter, and to provide improved means whereby any cessation of the operation-ofthe tape-forming or punching mechanism will automatically .throw the tapefeeding means of the transmitter out of operation and whereby the renewed operation of the tape-forming or punching mechanism will automatically throw the feeding means ,of the transmitter into operation. Further objects of the invention are to provide improved means for interrupting not only the tape-feeder of thetransmitter, but also the transmission of the impulses, and to provide interrupting means which will act only between completed signals.

The invention also seeks to provide, in a synchronous telegraph, means controlled by thetape-forming or punching mechanism for throwing the tape-feeding and signaltransmitting means of the transmitter into and out of operation, but which will not interrupt the transmission of the correcting lmpulses by which the instruments at the sending and receiving stations are maintained in. synchronism. A further object of the invention is to provide an improved station instrument having tape-controlled means for throwing the tape-feeder into and out of operation, and for interrupting the transmission of the signals.

With these and other objects in view, as will presently appear, the invention consists in the features of improvement hereinafter set forth, illustrated in the preferred form and arrangement in the accompanying draw ings and more particularly pointed out in the appended claims.

In the drawings, Figure l is a View in elevation of one of the improved station instruments. hand end of the instrument shown in Fig. 1.

Figs. 3 and 4 are detailed sections on the Fig. 2 is an elevation of the right- 1 lines 3-3 and 4--4: respectively of Fig. 1. v

Fig. 5 is a detailed horizontal section on the line 5-5 of Fig. 2. Fig. 6 is a plan view of a station instrument of modified form. Fig. 7 is a diagrammatic view illustrating the arrangement of the tape-forming or punching.

mechanism and the transmitter at one stair tion and the arrangement of the receiver at another station. Fig. 8 is a view of a short section of the tape.

Any suitable mechanism for forming or punching the tape may be employed, and can be actuated by a receiver mechanism under control of signals transmitted from a distant station, or, as usual, by a set of finger keys. A punch mechanism similar to that set forth in our Letters Patent of the United States No. 1,182,179, dated May 9, 1916, is diagrammatically illustrated in Fi 7. In this punch mechanism, the tape is fed through a passage or guide-way formed between a plate 10 and a die-block 1.1. The die-block 11 is provided with punches for embossing, or preferably perforating the tape, and, in the present instance, as set forth in the prior patent referred to, punches are arranged to form transverse rows of holes a in the tape (see Fig. 8), the perforations in the separate rows zbeing varied so that each row respects a different character or signal. The tape-forming mechanism is also provided with a punch for swing therewith, but are longitudinally shiftable, so that their ends can be shifted into and out of line with the punches 12. The selecting bars 16 are actuated by a set of hell cranks 17 and the latter in turn are operated by a series of upwardly projecting lugs upon a set of bails 19. Only one selecting punch and one bell crank 17 are shown,

it being understood that these parts are arranged in vertical series, as set forth in the above noted patent.

The bails 19 are variably controlled by. a set of finger keys 20 (only two of which are shown) and which are, provided with lugs 21 for variablyactuating the bails. Each key, however, is arranged to operate the" through the punch mechanism interm1ttently or step-by-step. For this purpose, it IS PI'OViClBd at'its outer end with a springheld pawl 25 which is arranged to engage the teeth of a ratchet 26, the ratchet being connected to a pin-toothed feed wheel 27, which is arranged to engage the perforations 13 of the .tape. As the actuator is moved forwardly to .punch the tape, the pawl 25 moves idly over the teeth of the ratchet 26, but on the backward movement of the actuator, the ratchet and feed wheel 27 are advanced one step. vided with slots therein to receive the teeth of the pin wheel 27, is arranged to hold the tape in snug engagement with the feed wheel. Preferably, also, the tape passes around a guide plate 29, which is so located that the tape is engaged by a number of the teeth of the feed wheel. By such a tape-punching mechanism, or its equivalent, the tape is formed in accordance with the $1 nals or characters to be transmitted.

n accordance with the present invention, the tape, as it is formed and intermittently advanced by the punch mechanism, is fed d rectly to the transmitter, which is provlded with a tape feeder. This feeder in the preferred construction shown is .in the form of a horizontal feed wheel 30 arranged at one end of the base plate 31 of the improved station instrument. The feed wheel is ar-- ranged behind an upright plate 32 on the base plate and the wheel projects through a slot in the plate 32, so that its teeth extend lnto a tape guide-way formed between the front face of the plate 32 and a narrow, thin plate 33, as most clearly shown in Fig. 5. The plate 33 is fastened to the-front of the plate 32, but isspaced therefrom as shown. The teeth of .the pin-toothed wheel 30 of course engage the perforations 13 of the tape and, advance the same, so that the trans- .Verse rows of perforations a coiipera-te with a vertlcal series of selecting switches C.

A pressure roll 28, prolatter being fixed at its lower end to a small base late 36 which is insulated from the main ase plate 31. The inner, pointed ends of the switches project into the tape guide, way between the plates 32 and 33. The outer portions of the switches C extend through the guiding comb bar '37 and their extreme outer ends are rovided with contacts which cooperate with a series of insulated contactscrews 38 that are carried by an upright plate 39. A series of springs 40 tend to hold the switches in engagement with the 'contact'screws, but as the'tapeengages the inner, pointed ends of the switches,

each switch will be held out of engagementwith its contact screw unless it drops into one of the perforations of the tape. In this way, the switches C are variably actuated to select the combinations of impulses as the tape is advanced by the feed wheel 30. As the tape is advanced, it is deflected for-' wardly by a guide late 41, which projects forwardly from t e inner edge of the plate 32.

The feed wheel 30 is mounted upon the lower end of a shaft 42. In the construction shown, this shaft is journaled in a sleeve 43 which depends from a support or head 44.

The latter isswiveled upon onev end of a.

horizontal shaft 45. The supporter head 44 is provided with a chamber or recess open at its upper portion and a worm 46 and-a worm wheel 47 are arranged within this recess and are fixed respectively to the shafts 45 and 42 to form a driving connection between the' shaft 45 and the feed wheel 30.. The sleeve 43 is provided at its upper end with a rearwardly projecting finger-piece 48 and by. means of this finger-piece, the supp,

port 44 and parts carried thereby can be swung through a short are about the shaft 45, to thereby move the feed wheel 30 out of the path of the tape, so that the tape can be readily placed within the guide-way or removed therefrom. This oscillating movement of the support .44 and the parts carried thereby, is guided by a U-shaped guide bracket 49 (see Figs. 2 and 5). which projects rearwardly from the plate 32 and engages flattened faces on the lower end of the sleeve 43. *A spring 50 extends between the bracket 49 and the finger 48 and holds the parts in the normal position shown in Fig. 2, with a lug 51 on the sleeve 43 engaging a stop screw 52 that is adjustably threaded through the upper end of the plate 32. An insulated arm 53 is connected to the head 44 and extends downwardly therefrom. Its lower end engages the forked outer end of a lever 54, which is mounted upon the upright shaft 35. The inner end of this lever carries a vertical pin 55 (see Fig. 5) and, when the support 44 is shifted to move the ,feed wheel 30 out of the path of the tape, the. pin 55 engages the switches C and swings them about the shaft 35 so that their inner ends are also shifted out of the path ofathe tape. A similar arrangement of tape feeder and tape-controlled selecting switches is set forth andclaimed in .the prior appli cation filed by us in the United States Serial No.-

Patent Ofiice March. 7, 1914,

As set forth in said prior application, the

ance with the present invention, means is provided for throwing the tape .feeding mech-' anism into and out of. operation. For this purpose, the shaft 45 is connected to a sition on the base plate and the contact 76 motor through the medium of a clutch and means, preferably 'atape-actuated switch,

controls the operation of the clutch and, in

turn is controlled by the operation of the tape-forming or punching mechanism. In

. the construction shown in Figs. 1 and 2, the

shaft is journaled at its outer endin a cross-piece 56, which extends across a circular opening in the upper portion of a vertical bracket 57 that projects upwardly from the base plate 31. The opposite end of the shaft, as shown indotted lines in Fig. 1, extends within a bore formed within an alined shaft 58. The latter is journaled at its outer end inthe cross-bar 59 which extends across the circular opening at the upper portion of a bracket 60 similar in construction to the bracket 61 (see Figswl and 3). The lefthand end of the shaft 58 is provided with a gear 62which' meshes with the'teeth of a pinion 63 on the shaft of a small electric motor 64. In this way, the shaft 58 is con- 8 tinuously driven during the operation of the 'shaft58, an arm'66 fixed to the adjacent v 4 5'- the machineandsuitable governor mechanism (not shown) is provided for maintaining the speed of the motor and the shaft 58 uniform; r I

The shaft 58 and the drive shaft 45 of the tape feeder are connected by a'clutch,"which,'

1n the preferred construction shown, comprises a clutch disk 65 fixed. to the end of end ofthe shaft 45 anda clutch dog 67 which is pivotally mounted on the arm 66, and which is. pressed by a spring 68 into en-.

gagement with the clutch disk 65. In the preferred construction shown, the dog is provided-with a tooth 69, which, when the clutch members are connected, engages a single notch 70 formed in the periphery of the clutch disk 65.

Beneath the clutch vmembers is arranged a solenoid magnet D. This magnet is mounted in a U-shaped frame 71 and the core d of the magnetis connected to the lower end of be thrown into operation.

a lever 72. The lever is pivoted intermediate lts ends to a lug 73 on the. bracket 71, and its upper end is connected to a trip pin 73 which is adapted to engage the clutch dog I The circuit of the magnet D is controlled by a pair of insulated contacts 76 and 77 (see Fig. 5), the contact '7 7 being fixed in pobeing. mounted upon the short arm 78 of a bell crank switch lever F. This bell crank is pivoted to thebase plate at 79, and its longer Y arm 80 extends horizontally behind the plate 32. Thearm 80 is provided with a curved end which projects forwardly in front of the tape guide-way and is provided with an-upwardly projecting pin 81 which engages the tape (see Fig. 7) as the latter passes'between the respective feeders of the tape former and the transmitter. A sprlng 82 connected to the shorter arm of the bell crank normally holds the contacts 76 and 77 .in engagement, so that the circuit of the magnet Dis held closed and the trip device 73 out of the path of the clutch dog 67.

The tape-forming or punching mechanism is, of course, operated independently of the transmitter and if it is operated with suffi- .cient frequency and speed to maintain slack in the tape between the former and the feedwheel 30 of thetransmitter, the switch contacts 76 and.77 will remain in engagement,

but if the operation of the tape-former is arrested, the continued operation of the transmitter mechanism will place the'tape "under tension and will thereby shift the arms 8Q.and 78 of the switch leverF, disengage the contact 76 from thecontact 77 :and open the circuit of the magnet D. The

spring 75 will then project-the trip pin 73, and, whenthe clutch dog' strikes the trip pin, it will be disengaged from the clutch disk 65 and the operation of the tape-feeder of the transmitter will be arrested. As soon as the operation of thetape former is resumed, the portion of the tape between it and the transmitter will become slack and spring 82 will reengage the contacts 76 and 77, energize magnet D and return the trip pin 73. to itsnormal position, The dog 67 will then reengage the clutch disk 65 and the tape feeder of the transmitter will again In this way, the tape'feeder of the transmitter is automatically thrown into and out of operation by wardly incline trip devices which in turn are controlled by the operation of the tape. former.

The shafts 58 and 45 are driven in the direction indicated by the arrow. in Fig. 3, and preferably the ivoted clutch dog 67 is reard with reference to the direc 'tion of movement, as shown, so that it may be readily disengaged when it strikes the trip pin 73. To prevent the backward movement of'the shaft 45 when the clutch dog is disengaged, a disk 83 is fixed to the shaft 45 adjacent the arm 66, and is provided with a recess at one point having a shoulder- 84. When the clutch dog 67 is disengaged, a spring arm 85, which projects upwardly from the bracket 71, is arranged to engage the. shoulder 84 and hold the shaft 45 andparts connected thereto against backward movement.

As the tape is advanced by the transmitter feed wheel 30, the transverse rows of openings a therein are successively brought opposite the inner pointed ends of theswitches C. The body of the tape will hold the switches out of engagement with their cooperating contacts, but, when an switch drops into a perforation, it is quic ly shifted by its spring into engagementwith its contact. The switches thus serve to select re .va-s of synchronizing impulses, the switch arm 2 could be mounted on the shaft 45 so as to be thrown into and out of operation with the tape feeder. But the improved in-.

strument is more particularly designed for telegraphsystems in which synchronizing r or correcting impulses are imparted at regular intervals to the line whether or not character signals are also transmitted and the transmitter switch arm e is mounted upon the shaft 58with the cooperating annular disk E mounted upon the upper aunular portion ofthe bracket 60 and surrounding the shaft. The. disk E is pro vided with two additional contacts 7 and 8 (seeFig. 7 and the transmitter switch arm is continuously rotated during the operation of the machine, so that even if the feed of the tape be interrupted, correcting impulses will be transmitted over the line as the switch arm passes over the contacts 7 and 8.

The set of five selecting switches C serveto variably connect the contacts 1, 2, 3, 4 and i 5 of. the transmitter disk E to a source of current, to thereby selectthe combinations of impulses which represent. the difierent characters or signals,-and which are transmitted to the line-as the switch arm e passes over these contacts. In, the referred form shown,.the passage of the switch arm e over thecontact 6 is arranged to transmit a restoring impulse, and, as above stated, the passage of the switch arm over the contacts 7 and 8 transmits a correcting impulse.

When thev switch F is vshifted by the tape, the, magnet D is at once denergized and trip pin 73 is projected. But the clutch members are not disengaged until the oo'nnectedshafts 45 and 58 aremoved far enoughto bring the clutch do 67 into engagement with the trip 'pin'73. he shafts 45 and,58 and the parts connected thereto rotatein the direction indicated by the arrows in Figs. 3 and 7 and the clutch dog 67 is definitely positioned relatively to the transmitter switch arm e so that it cannot come into engagement with the pin until the switch arm occupies a position between the contacts '6 and 1. Hence the trip devices'are only operative atthe end the transmission of a completed character signal.

It should also be noted that in the preferred construction shown, which is adapted for a synchronous telegraph system in which correcting impulses are imparted to the line at regular intervals whether or not char- I acter signals are also transmitted, the notch 70' in the clutch ,disk 65 occupies a definite position relatively to the switch arm e, so that the clutch members can only be rengaged when the transmitter switch arm e is in position to commence the transmission of a character signal. In the preferred construction shown, the clutch mechanism is so arranged that the members thereof areengaged and disengaged as the transmitter switch arm 8 passes over the contacts 7 and 8, which, as-sta ted, serve to transmitthe correcting impulses, and which are transmitted independently of the tape which selects the character signals. By reason of this construction, the clutch members connect the transmitter switch and the tape-feeder in definite relation and the trip mechanism is vonly operative between completed signals to arrest the feed of the ta'pep The selecting switches C, as stated, serve to variably connect the contacts 1, 2, 3, 4 and 5 of the transmitter disk to a source of current and preferably a second set of" five switches g (see Fig. are interposed between the selecting-switches C and the transmitter disk, the switches g being'operated by a set of magnets G The selecting switches C are all connected to one of the branches of the conductor 24, which leads from the local battery H, and thc-contacts of these switches are connected respectively bya set of conductors 85 to the coils of the magnets (ir, the latter beingalso connected to the ground or by a suitable return conduct-or to the local battery H. The switches g are connected respectively by a set of conductors 86 to the contacts 1, 2, 3, 4 and 5 of the transmitter disk.

The characters are preferably represented by permutations of five impulses of oppositepolarity. For this reason, the switches 9 form pole changers, the contacts of which are connected by conductors 87 and 88 to the opposite sides of a divided battery H, the normally engaged or back contacts being connected to the' negative pole of abattery by the conductor 87 and the normally disengagefd or front contacts to the positive polethereof by the conductor 88. The conductor 88 leads directly from the positive pole of the battery H, but, for purposes hereinafter described, a switch is interposed in the conductor 87. The conductor 87 also extends to the contact 6 of the transmitter disk E, and the conductor 88 from the positive pole of the battery is connected to the contact 8. The contact 7 of the transmitter disk is permanently connected to the negative pole of the battery by a. conductor 89. As the transmitter switch 6 passes over the contacts 1, 2, 3, 4 and 5, it imparts to the line permutations of positive and negative impulses which are Varied in accordance with the operation of the tape-controlling switches C and pole-changers g and which represent the different character signals. As the transmitter switch passes over the contact 6, a negative restoring and printing impulse is imparted to the line, and as it passes over the contacts 7 and 8, a negative correcting impulse followed by av positive impulse is transmitted.

base plate 31 and spring 92 interposed be' When the feed of the tape is arrested by the operation of the trip pin 73, the transmitter switch e continues its operation to impart the correcting impulses to the line. To prevent this continued operation of the switch 6 from repeating character signals in tween the block and a clip 93 on the bracket holds the switch in engagement with the cam K. The switch cooperates with an insulated contact screw 94, which is mounted upon a bracket 95 that projects upwardly from the base plate. Theswitch 7c is connected to one of the battery wires 24 (see Fig. 7), while its contact 94 is connected by a conductor 96 to the coil of a magnet J which operates the switch j. The coil of this magnet is also connected to the ground or by a suitable return wire to the local battery H.

During the greater part of the revolution of the shafts 45 and 58 and of the transmitter switch arm a, the cam K holds the switch is in open position. Vhen the switch drops into a notch 97 in the cam, it engages the contact 94 and closes the circuit of the magnet J. This notch is so located with respect to the clutch dog 67 that the circuit of the magnet J is thus held closed whenever the clutch dog is tripped to arrest the movement of the shaft 45 and of the tape feeding mechanism, so that the switch j is shifted to disconnect the normally engaged contacts of the pole changers g from the negative termination of the divided, battery H, and the transmission permutations of positive and negative impulses or charactcr signals is interrupted. Preferably, the switch j is provided with a normally disengaged contact, which is connected to the conductor 88 by the conductor 98, so that, when the feed of the tape is arrested and the magnet J is energized by the operation of the switch 70, all of the contacts of the pole changers g and also the contact 6 of the transmitter disk, are connected to the positive terminal of the battery H, and all the impulses imparted by the transmitter switch 6 are positive, except. the negative correcting impulse which is imparted to the line as the switch passes over the contact 7. In the system to which the invention is applied, the positive. impulses have no effect on the receiving instrument at a distant station and, when the feed of the tape is interrupted, no impulses are transmitted to the line which will affect the instrument at the receiving station, except the correcting im pulse. The latter, however, is imparted to the line and the instrument at the receiving station is maintained in synchronism with the transmitter and is ready to receive the character signals as soon as the feed of the tape and the transmission of the character signals is resumed.

The transmitter switch arm 6 is fixed to a hub 99, which is mounted on, but insulated from the shaft 58. The switch arm carries a brush 100 which moves over the contacts of the transmitter disk E, and also .is preferably provided with a piece of felt 101 which is saturated with oil and moves over the contacts to remove dust therefrom. The hub 99 is engaged by a brush 102, which is pivotally mounted and spring-pressed into engagement with the hub in the manner already described. in connection with the switch 70.

The form of instrument shown in Figs. 1,2, 3, and 4 is designed for a station such as a news-distributing point, from which messages are transmitted to a number of receiving stations. Such aninstrument is preferably provided with means for recording the messages transmitted. .For this purpose, a contact disk M is mounted upon the upper annular portion of the bracket 57, and a switch arm m which cooperates with the disk is mounted on the shaft 45. The home recording disk M and switch arm m are similar in construction and arrangement to the transmitting disk and switch arm, the disk M having contacts 1, 2 3, t, 5 and 6 corresponding to those of the transmitter disk. But on the home recording disk the contacts 7 and 8 are not required.

The contacts 1, 2, 3, 4 and 5 of the home recording disk M are connected by a set of conductors 103 to the coils of a set of five magnets N. The conductors are also connected to the switches n of these magnets. The contact 6 of the disk M is connected by aconductor 104to the coil of a magnet P and to a switch 2 controlled by this magnet. The switches 11- are normally open and the contacts thereof are connected by a con ductor 105 to the contact of a normally closed unlocking switch 0 This switch is connected to the battery wire 24 and is operatedby a magnet R. The coil of the magnet R is connected by a conductor 104 to the contact of the normally open switch 27. i

The clutch members 67 and 65 connect the shafts 45 and 58 and, the switch arms m and e thereon in definite relation, and, in normal operation, when the clutch members are in engagement, the switch arms rotate in unison and pass over the corresponding contacts 1. 2,3, 4, 5 and 6 synchronously. The brush 102 of the transmitter switch armis connected by a conductor 106 to the coils of a polarized relay S. the switch tongue 8 of which is connected to the local battery wire 24. The contact of this switch tongue is con nected by a conductor 107 to the brush 108 of the recording switch arm 222. Negative impulses through the relay S will hold the relay switch tongue 8 in closed position, but positive impulses will shift it to open position. As the switches C are variably operated by the tape, the pole changing magnets G are variably operated and, by means of the pole changers g and the conductors 86, 87 and 88, the contacts 1, 2, 3, 4 and5 of the transmitter disk E are variably connected either to the positive or the negative pole of the divided battery I-I'. while the contact 6 is connected to the negative pole thereof. As the transmitter switch -e passes over these contacts. these positive and negative impulses are transmitted through the relay S and the relay tongue .9 is vibrated in accordance therewith to connect the switch arm m to the battery or to disconnect it therefrom.

.This switch arm, as stated, operates in unison with the transmitter switch arm, so that as it passes over the contacts 1, 2, 3, 4 and 5, it will variably operate the magnets N in accordance as to whether or not it is connected to the battery as it passes over the corresponding contacts. That is to say, if the switch arm mis connected to battery as it passes over the contact 1, the first one of the set of magnets N will be energized. If the switch arm m is not connected to battery at this time, the first magnet X will not be 0perated. In this way, the set of magnets N are variably operated as the switch arm m rotates and in accordance with the permutations of positive and negative impulses im' parted by the transmitter switch 6.

\Vhen any one of the magnets N is energized in this way, it. operates the corresponding switch 11 and a circuit can be traced from the battery wire 24, locking switch 1', conductor 105, to the shifted switch 11, and thence through the coil of the corresponding magnet N. In this way, the magnets N that are operated remain energized until the switch arm in passes over the restoring contact 6. At this time. the transmitter switch arm e passes over its contact 6 and a negative impulse will pass through the relay S to thereby connect the switch arm m to battery and close a circuit through the magnet P. This magnet quickly shifts its switch 12 so that the circuit is also closed through the magnet It. The latter then opens the unlocking switch 1' and disconnects all of the operated magnets N from battery and the set of magnets N are then in condition for operation in accordance with the succeeding character signal. The set of magnets N can of course be employed for operating a suitable printer to record the transmitted messages.

The form of instrument shown in Fig. 6 is designed for a station which both transmits and receives messages. For this purpose. the motor 64 is arranged to operate both the transmitter switch mechanism and a receiver switch mechanism. Preferably, the receiver switch mechanism is mounted upon a separate shaft and is geared to the transmitter mechanism to rotate at a slightly faster speed. In this preferred form, the shaft 58, which carries the transmitter switch arm 6 is extended at its inner end, is journaled in a bracket 109 which extends upwardly from the base plate 31', and is provided with a gear 110. Furthermore, in this instrument the home recording disk and switch arm on the shaft 45 are omitted and the outer end of this shaft is journaled in a bracket 57. In other respects, the construction of the transmitter and tape feeding mechanism is the same as that shown in Figs. 1 to- 5 inclusive, the upper portion of Fig. 6 being substantially a plan view of the parts shown in Figs. 1 to 5 inclusive.

' The; receiving switch mechanism comprises a disk T, which is mounted upon a bracket 111 on the base plate and which, like the home recording disk heretofore described, is provided with a series of contacts 1, 2, 3, 4, 5 and 6. (See Fig. 7.) The cooperating rotating switch arm't is similar in construction and arrangement to the rotating switch arms 0 and m and is mounted on a shaft 112 which extends through the disk E and is journaled' at its outer end in a'U-shaped member'113 on the bracket 111. The disk T is preferably rotatably adjustable, being held in place on the bracket 111 by clips 114. The opposite end of the shaft 112 is journaled in the bracket 109 and carries a sleeve ,115loosely mounted thereon. This sleeve is provided with a ear 116,

which is connected to the gear 110 y an intermediate idler 117, that is mounted upon the bracket 109. Sleeve 115 also has a smaller gear 118, which meshes with a pinion 119. The. pinion is journaled on a short shaft 120 which is carriedb an arm 121 that is keyed to the shaft 112. he opposite. end of the short shaft 120 is provided with a star wheel 122, the teeth of which are engag'ed by a roller 123 on a spring-held arm 124. The arm 124 is mounted on the arm 121 and normally prevents the'r'otation of the star wheel 122 and the relative rotation of the gears 118 and 119, so that the shaft 112 and receiver-switch arm t rotate in unison with the gear 116. l

- A correcting magnet V is provided with an armaturelever 126 having a pin '127'there on (see Figs. 6 and 7). When this magnet is energized, the'pin-127 is projected into the teeth of the star wheel 122 and the movement of the shaft 112, and receiver switch arm t thereon, is retarded. The circuit of this magnet iscontrolled by the line relay at the receiving station (which of course. is controlled by the transmitter at the sending station) and by a switch w at the receiving station. The switch w is operated by a cam on the shaft 112, the construction of these parts being similar to cam K and switch is previously described. That is to say, the cam serves to normally "hold the switch in open position, but when a'notch 128 is in line with the switch, the latter engages a contact 129.

Fig. 7' shows the transmitting and home recording circuits at one station and the receiving circuits at another station. The brush 102 which engages the transmitter switch e-is, as above stated, connected to the relay S that controls the home recorder, if

one is employed. The brush 102 may also be connected, if desired, directly 'to' the-line circuit, butit preferably extends through the coils of a polarized transmitting relay ceiving switch arm 25.

X, having 'a switch tonguesa. -Theb1iaas of the switch tongue are connected by con ductors 130 to the positive and'negat'ive poles of a divided line battery H If the station is usedefor. transmitting only, the tongue a: of the transmitterrelayis connected directl to-the line conductor. 1 If means are provi ed ateach station bothfor:

nectedfto the line conductor 133 andto'a balancing artificial line 134. The-switch tongue y of the line relay-Y at each station,

is connected by one of. the branch, conductors 24 to-the local battery H and the con-. tact of this switch ton ue is connected by a conductor 135 to the rush 136, of the. re.-v

The conductor135 is also'connected to the switch w and the contact 129 of the latteris connected bya cons ductor 137 to the correcting magnet V. The circuits controlled by the receivingswitch mechanism are similar in. all respects'to that controlled by the home recording switch mechanism. 2 1

It will be understood that where the cons nected stations both transmit and receive. messages, both stations will be equipped with tape-forming -means, transmitting 1 and receiving mechanism and the necessary trans mitting and receiving circuits. 7 In such cases, as stated, the line is arrangedfor duplex operating, the line relay ateach station "responding only to messages'transmitted fromthe other station, so that" messages can be simultaneously transmitted and received at the connected stat-ionswithout' interference. When messages are transmitted in one direction only, th'e'line relay and'the connected receiving apparatus and circuits are omitted at the transmitting station, and the transmitting relay and connecting transmitting apparatus and circuits are omitted at the receiving station or stations.

Whether the line is'arranged for transmission of messages in both directions or in one direction only, the rotating receiver switch at a station is driven slightly faster than the transmitter at the distant station and there.

ceiver switch is retarded as required by the switch of the same innet B, andis advanced by the intennittently operating feedwheel 27 of the tape former. Thence the tape passes around the pin 81 of the switch F and through the guide-way be- 7 tween the plates 32 and '33 of the transmit- 'ter. Here it is engaged by the feed wheel 30v and moves past the switches (1 When the shafts 45 and 58 are connected by the clutch members, the feed wheel 30 is continuously rotated in definite timed relation with therotating transmitter switch 6, the gearing 1 being such that as the switch rotates through a single revolution, the tape is advanced a.

space equal to the-distance between the transversev rows of perforations a. The set of switches C are preferably arranged at right angles to the path of movement of the tape and the transverse rows of perforations a are slightly inclined thereto, as shown in Fig. 8, so that the tapemaybe continuously.

advanced and at thesame'time permit the accurater'egister of the switches C 'with'the perforations of the tape as the transmitter switch e passes over the corresponding contacts 1- 2, 3, 4 and 5.

As the magnets are variably energized and the pole changers g variably actuated to collnect the contacts 1, 2, 3, 4 and 5 of the trans- 'mitter disk either to the positive or negative terminal of the divided battery H, and as the transmitter switch passes over these contacts and over the contacts 6, land 8, permutations of impulses of opposite polarity representing the characters will be transmitted, each character signal being followed by negative restoring and correcting impulses and a positive impulse. These pulses are imparted to the line by the trans mitting relay X at the sending station; and the line relay Y at the distant receiving station will be operatedin accordancetherewith to shift the switch tongue y and open and close the local circuit through the conductor 135. If a home recorder is employed at the sending station, the transmitted impulses will pass through the relay S and open and close the localcircuit through the home recording switch m; The operation of this,

ing station, isconnected to local batter-y through the medium of theswitch w and the line relay switch y, bothof which be simultaneously closed for a suflicient interval of time to energize the correcting magnet. As the character Si is and the restoring impulse are receiv the cam W will hold the tape asses beneath the switches C,

the switch '10 open. As the transmitter switch e of the sending-station passesover the contact 7 and impartsacorrecting im pulse to the line, the switch'y of the linereay Y at thereceivin'g station will be 7 This negative impulse is quickly followed a positive im ulse as the transmitting switc passes over its contact 8, so that the line relay switch y'is only closed for a brief interval; During this brief interval, the switch w will-not be cl0sed,or 'will'not be closed ,for a sufiicient length of time to em ergize thecorrecting magnet V. But as the receiver switch -mechanism gains over thethe tape actuating switchF is connected to the local battery and the contact 7'? is con nected byja conductor .138 to'the coil of the 9 clutch controlling magnet jD. Normally, these contacts are in *enga ement and the magnet is energized to' hold the trip pin 73 hits inoperative: position. If the operation of the tape former isinterrupted, the tension of the tape will shift theswitch F, open the circuit of the magnet'D and the tin pin will be projected into the fpath ofthe clutch members. The latter, a er the character signal thenbeing transmitted Ltothe line is completed, will be' disengaged and'the operatlon oft-he transmitting tape feeder and also of the home recorder, if, one is employed, will be arrested. Atthe same time, the cam on the shaft 45 will be arrested with the notch 97 therein opposite the switch k so thatthe latter will engage its contact '94; and close a circuit from battery wire 24: through contact 94-qandconducto r 96 to the magnet J. Switch jis'then shifted into engagement with its front contact and all of the contacts of the polechangers 9 will be connected to the positive terminalv of the battery H'.. Then positive impulses only will be imparted-to the line, except that once every revolution as the transmitter switch 0 a passes over the contact Tit will transmitf'a ne ative correcting impulse.v Thus the switch y of the 'line.relay at the receiving be closed at intervals by the negative correcting impulses, These correcting impulses will maintain the receiving switch mechanism at the distant station in. synchronism with the transmitter switch mechanism at 5 the sending station and ,ready to receive character. 'as soon 'as the feed of the tape at the sending-station is resumed. This of course occurs as soon as the operation of j. the tape former relieves the, tension of the ce station will be held open, except that it wil i The improvement insures the transmis sion of the messages as fast as the tape is formed and avoids the necessity of first forming the tape and subsequently and separately running itthrough the transmitter mechanism. I Y

It is obvious that numerous changes may be made in the details set forth without departure from the essentials of the invention as defined in the claims.

We claim as our invention:

1. In telegraphs, the combination with a rotary transmitter switch and a tape feeder, of mechanical driving connections between said switch and feeder fo operating the same in definite timed re ation, a trip for stopping and starting said feeder while permitting the continued operation of said switch, a tape former and a tape actuated device between said former and said tape feeder for controlling said trip.

2. In telegraphs, the combination with a rotary transmitter switch mechanism, and a tape feed-wheel, of a common drive shaft mechanically connected to said switch mechanism and said feed-wheel for rotating the same in timed relation, a former for the tape having a means for advancing the tape,

means for operating said tape-former independently of said transmitter switch mechanism, and means controlled by the movement of the tape between saidformer and said feed-wheel for automatically stopping and starting the latter.

3. In telegraphs, the combination with a rotary transmitter switch mechanism, a set of tape controlled switches for selecting the transmitted impulses, a tape feed-wheel, and means for constantly rotating said switch mechanism andsaid tape feed-wheel intimed relation, of'aformer for the tape having a tape feed-wheel, means for actuating said tape-former and its feed-wheel independently of said transmitter switch mechanism, a tape-actuated switch interposed between said feed-wheels, and means controlled thereby for throwing said transmitter feed-wheel into and out of operation. y

4. In telegraphs, the combination with a rotary transmitter switch mechanism, a set of tape-controlled switches for selecting the transmitted impulses, a tape feed-wheel, and means acting, when in operation, to actuate said switch mechanism) and said ing a tape feed-wheel, means for intermittently actuating said punch and its feedwheel, and means including two rotary clutch members and a disengaging trip therefor controlled by the movement of the tape between said feed-wheels for stopping and starting said transmitter feed-wheel.

5. In selectivetelegraphs, the combination with a transmitter switch and a tape feeder, of mechanical driving connections between said switch and feeder for operating thesame in definite timed relation, a trip mechanism arranged to act only between completed signals for stopping and starting said feeder while permitting the continued operation of said switch, a tape former operable independently of said tape feeder and means underthe joint control of said tape former and said feeder for controlling said trip mechanism.

6. In selective telegraphs, the combination with transmitter switch mechanism, a tape feeder and operating means therefor, of a clutch for mechanically connecting said switch mechanism and said tape feeder in definite relation, said clutch being operable to stop and start said feeder'while permitting the continued operation of said switch mechanism, a trip arranged to control said clutch only between completed signals, a tape former, means for operating the latter independently of said switch mechanism and said feeder and means controlled by the operation of said tape former for actuatingsaid trip.

7. In selective telegraphs in which the signals are represented by combinations of impulses, the combination with transmitter switch mechanism, of a set of tape-controlled switches for selecting the transmitted impulses, a tape-feeder for constantly advancing the tape past said switches in timed relation to the operation of said transmitter switch mechanism, a former for the tape, means for operating the same independently of said transmitter switch mechanism, a

tape-actuated switch interposed between said former and said tape feeder, and means controlled thereby and arranged to act only between completed signals for interrupting the operation of said tape-feeder and of said impulse-selecting switches.

8. In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination with a set of tape-controlled switches for selecting the impulses, switch mechanism for transmitting the selected impulses and a correcting impulse, a tape feed-wheel, and means for operating said transmitter switch mechanism and for constantly rotating said feed wheel in timed relation with said transmitter switch mechanism, of'means arranged to actonly between completed signals to interrupt the operation of said impulse selecting switches and said tape-feeder, a

former for the tape and means controlled by the operation of said former for controlling said interrupting means.

9. In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combinationwith tape controlled devices for selecting the impulses, switch'mechanism for transmitting the selected impulses and a correcting impulse, a tape-feeder, and means for operating said transmitter switch mechanism and said feeder in timed relation; of means for interrupting the operation of said impulse selecting devices, a clutch for mechanically connecting said interrupting means and said tape-feeder to said switch mechanism in definite relation thereto, a trip arranged to disengage said clutch only between completed signals, a former for the tape operative independently .of said transmitter switchmechanism, and means controlled'by the operation of said former for actuating said trip.

10. In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination with a rotary switch mechanism for transmitting the signals and correcting impulses, of a tape-feedena clutch mechanically connecting said switch mechanism and said tapefeeder in definite relation, a trip for disengaging said clutch between completed signals, 'a tape former and means controlled by the operation of said former for actuating said trip.

11. ,In-synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination with a rotary switch mechanism for transmitting the signals and correcting impulses, of a tape-feeder, a clutch mechanically connecting said switch mechanism and said tapefeeder in definite relation, a. trip for disengaging said clutch between completed signals, a punch for forming the tape having a tape-feeder, means for actuating said punch independently of said transmitter switch mechanism, a tape-actuated switch controlled by the operation of the tape-feederof said punch, and means controlled by said switch for actuating said trip. I

12. In synchronous selective telegraphs in which the/signals are represented by combinations of impulses, the combination with a set of tape-controlled switches for select=' ing the signals, a rotary switch mechanism for transmitting the signals and correcting impulses, and a tape feed-wheel,.of a rotary cam, means controlled thereby for interrupting the operation of said 'selecting switches, clutch mechanism for connecting said cam and said feed-wheel to said transmitter switch in definite relation, trip de I vices for said clutch mechanism, a former for-the tape operative independently of said transmitter switch mechanism and having means for advancing the tape and means controlled by the movement of the tape between said former and said feed-wheel for actuating said trip.

13. In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination with a set of tape-controlled switches for selecting the signals, a rotary switch mechanism for transmitting the signals and correcting impulses, a tape feed-wheel, and means for continuously rotating said switch mechanism and said feed-wheel, of a clutch for connecting said switch mechanism and feedwheel in definite relation, a trip for releasing said clutch between completed signals, a punch for forming the tape having a tape feed-wheel, means for intermittently operating said punch and its feed-wheel, and means controlled by the operation of said punch for actuating said trip.

14. In synchronous selectivetelegraphs in which the signals are represented by permutations of a definite number of impulses of opposite polarity, the combination with a set of tape-controlled pole-changers for selecting signals, continuously operating switch mechanism for transmitting the signals and correcting impulses, a tape feedwheel, and means for constantly operating said feed-wheel in timed relation with said transmitter switch mechanism, of means arranged to operate between completed signals for interrupting the operation of, said pole-changers .and of said feed-wheel, a former for the tape operative independently of said transmitter switch mechanism and having means for advancing the tape, and means controlled by the movement of the tape between said former and said tapefeeder for controlling said interrupting means.

15. In synchronous selective telegraphs in which the signals are represented by permutations of a definite number of impulses of opposite polarity, the combination with a set of tape-controlled pole-changers for selecting'signals, continuously operating switch mechanism. for transmitting the si nals and correcting impulses, a. tape-fee er, and means for operating said feeder in timed relation with said transmitter switch mecha nism, of interrupting devices arranged to operate between completed signals to connect all the contacts of said pole-changers to the same battery terminal and to throw said tape-feeder into and out of operation, a former for the tape operative independently of said'transmitter switch mechanism, and a tape-actuated switch interposed between said former and said tape-feeder for controlling said interrupting devices.

16. In synchronous selective telegraphs in which the signals are representedby permutations of a definite number of impulses of opposite polarity, the combination with a continuously rotating switch mechanism for transmitting the signals and correcting impulses, a set of tape-controlled pole-changiers for selecting the signals, and a tape fee wheel, of a rotary member, means controlled thereby for intermittently connecting the contacts of said pole-changers to the same battery terminal, a clutch for connecting said rotary member and said feed-wheel to said rotary switch mechanism in definiterelation, a trip for releasing said clutch between completed signals, an intermittently operating punch for forming the tape having tape advancing means, and devices controlled by the operation of said tape-advancin means for actuating said trip.

17. n a selective telegraph in which the signals are represented by combinations of impulses, the combination with switch mechanism .for transmitting the signals, tape-controlled switches for selecting the combinations of impulses, and means for constantly feeding the, tape past said switches in timed relation with the operation of said transmitter switch mechanism, of means acting only between completed signals for interrupting the transmission of the selected impulses and the feed of said tape, a former for the tape operative independentlyof said transmitter switch mechanism,

and means controlled by the operation of said tape former for actuating said interrupting means.

18. In a synchronous selective telegraph in which the signals are represented by combinations of impulses, the combination with tape-controlled devices for selecting the signals, continuously operating switch mechanism for transmitting the signals and restormg and correcting impulses, a tape-feeder and means for operating said feeder in timed relation with said transmitter switch mechanism, of means arranged to act onlybetween completed signals for interrupting the operation of said tape feeder and the transmission of selected impulses and of the restoring impulses while permitting the continued transmission of the correcting impulses, a former for the tape operative independently of said transmitter switch mechanism and means controlled by the operation of said tape former for actuating said interrupting means.

19. In a synchronous selective telegraph in which the signalsare represented by permutations of a definite number of impulses of opposite polarity, the combination with tapecontrolled pole-changers for selecting the signals, a rotary switch mechanism for transmitting the selecting impulses and restoring and correcting impulses, of a tape-feeder, a rotary member, means controlled by said member for changing the polarity of the restoring impulse and for connecting all the contacts of said pole-changers to the same battery terminal, a clutch for connecting said tape-feeder and said'rotary member to said rotary switch mechanism in definlte relation thereto, a trip for said clutch, a tape former operative independently of said switch mechanism, a tape actuated switch controlled by the operation of said tape former and means controlled by said switch for actuating said trip.

20. In selective telegraphs in which the signals are represented by combinations of impulses, the combination with tape-controlled means for selectirlg the signals, and a switch mechanism for transmitting the selected signals, of a home recording switch mechanism,-a tape-feeder,means for operating said switch mechanisms and said tapefeeder in timed relation, an independently operative tape-former, and means controlled by the operation of said former and actingonly between completed signals for interrupting the operation of said home recording switch mechanism and said tape-feeder.

21. In selective telegraph instruments, the combination of a rotary transmitter switch, tape controlled means for selecting the transmitted impulses, a feeder for engaging and positively advancing the tape, a common drive shaft mechanically connected to said switch and said feeder operating the same in definite timed relation, and a clutch intersaid shaft and said feed wheel and controlled by the movement of the tape for automatically stopping and starting said feed wheel.

22. In selective telegraphs in which the signals are represented by combinations of impulses, the combination of transmitter switch mechanism, a set of tape-controlled switches for selecting the signals, a toothed feed-wheel arranged to'constantly. engage the tape to positively advance the same, means acting, when in operation, to continuously rotate said feed-wheel, .a switch actuated by the movement of the tape, and means controlled thereby for stopping and starting said feed-wheel.

23. In a selective telegraph in which the signals are represented by combinations of impulses, the combination of a transmitter having a set of tape controlled signal selecting switches and a tape feeder, an independently operable tape former and means for arresting the operation of said transmitter comprising cooperating rotary clutch members, a trip operable to disengage said clutch members only between completed signals, and means under the joint control of said transmitter and said tape former for actuposed in the mechanical connections between switch, a, set of tape controlled signal selecting switches, a feed-wheel for advancing the tape, a drive shaft for said transmitter switch, reducing gearinginterposed between said shaft and said feed wheel, arranged, when in operation, to continuously rotate said wheel, a clutch for connecting said shaft and gearing, a tape-actuated device, and means controlled thereby and operative only between completed signals for throwing said clutch into and out of operation.

25. In a telegraph apparatus, the combination of tape controlled means for selecting the signals, switch mechanism for transmitting the selected signals, means for feeding the tape in timed relation with said switch mechanism, and means for interrupting the feed of the tape and the transmission of signals comprising cooperating rotary clutch members and a disengaging trip therefor, said rotary clutch members and cooperating trip being operable only between completed signals to start and stop said tape feeding means.

.26. In a telegraph apparatus, the combination of tape controlled means for selecting the signals, switch mechanism for transmitting the selected signals, means for feeding the tape in timed relation with said switch mechanism and means for interrupting the feed of the tape and the transmis- S1011 of signals comprising coiiperating ro tary clutch members, disengaging trips for said rotary clutch members, said clutch members and said trip being operable only between completed signals to start and stop said tape feeding means, an electromagnet for operating said trip, a tape former and means under the joint control of said tape former and said tape feeding means for controllin the circuit of said magnet.

27. 11 an instrument for selective synchronous telegraphs, the combination of a set of signal selecting switches, a continuously rotating switch for transmitting the selected signals and correcting impulses, a rotating feed-wheel for the tape, clutch members for connecting said transmitter switch and said feed-wheel to continuously rotate the latter in timed relation with said transmitter switch, a trip for said clutch members operative only between completed :signals, and a device actuated by the movement of the tape controlling said trip.

28. In an instrument .for selective synchronous telegraphs, the combination of a set of signal selecting switches, a continuously rotating switch for transmitting the selected signals and correcting impulses, a rotating feed-wheel for the tape, clutch members for connecting said transmitter switch and said feed-wheel to continuously rotate the latter in timed relation with said transmitter switch, a trip for said clutch members operative only between comneeasm pleted signals, a magnet for effecting the movement of said trip to its operative and inoperative positions, and a switch actuated by movement of the tape for controlling said magnet.

29. In a selective telegraph instrument, thecombination of a rotary transmitter switch, a set of tape-controlled switches for selecting the signals, a feed wheel for the tape, a rotar member for interrupting the operation 0 said switches, a clutch for throwing said rotary 'member and said feedwheel into and out of operation, and a trip for said clutch operative only between completed signals.

30. In a selective telegraph instrument, the combination of a rotary transmitter switch, a set of tape-controlled pole-changers for selecting the signals, a rotary member, means controlled thereby for connect ing the contacts of said pole-changers to the same battery terminal, ta tape feedwheel, clutch members for connecting said feed-Wheel and said rotary member to said transmitter switch in definite relation, a trip controlling the engagement and disengagement of said clutch members, a switch actuated by the movement of the tape, and means controlled thereby for actuating said the combination of. a rotary transmitter switch, .a Set of tapecontrolled signal selecting switches, a feed-wheel for the tape, drive shafts for said transmitter switch and said feed-wheel arranged in line, speed reducing gearing between said feed-wheel and its drive shaft, a cam on said feed-wheel drive shaft, means controlled thereby for interrupting the operation of said selecting switches, clutch members operative only to connect said shafts in definite relation, a tri operative only between completed signa s for disengaging said clutch members, and a tape-controlled means for operating said trip.

32. In a selective telegraph instrument, the combination of rotary transmitting and home recording switch mechanisms, tapecontrolled means for selecting the signals, a feed-wheel for positively advancing the tape, and common drive mechanism for perforations of said tape to move the same rows of perforations and said set of selecting switches being relatively inclined, and common drive mechanism for rotating said transmitting and home recording switch mechanisms and said feed-wheel in timed relation.

34:. In a selective telegraph instrument, the combination of rotary transmitting and home recording switch mechanisms, tapecontrolled means. for selecting the signals,

a feed-wheel for positively advancing the tape, clutch members for connecting said feed-wheel and said home recording switch mechanism to said transmitter switch, means for continuously rotating said transmitter'switch, a trip operative only between completed signals for controlling the engageme'nt and disengagement of said clutch members, and tape-controlled means for shiftin said trip.

35. n an instrument for synchronous selective telegraphs, the combination of ro tary transmitting and receiving switch mechanisms, a common drive shaft therefor, tape-controlled means for selecting the.

transmitted impulses, a feed-wheel for advancing the tape, clutch members for connecting said feed-wheel and said transmitter switch mechanism in definite relation, a trip operative only between completed signals to disengage said clutch members, tapeactuated means for controlling said trip, and correcting devices for shifting said receiving switch mechanismrelatively to said drive shaft. c v

36. In an instrument for synchronous selective telegraphs, the combination of rotary transmitting and receiving switches, a drive shaft whereon said transmitter switch is mounted, connecting gearing between said shaft and said receiver switch, correcting devices for shifting said receiver switch relatively to' said gearing, tape-controlled signal selecting switches, a feed-wheel for the tape, clutch member between said drive shaft and said feed wheel for connecting the latter to said transmitter switch in definite relation, a trip operative only between completed signals for disengaging said clutch member, and tape-actuated means for controllin said clutch.

37 n a synchronous telegraph in which the signals are represented by combinations of impulses, the combination of'a rotating transmitter switch at one station for imparting the signals and correcting impulses to the line, a receiving switch mechanism at a connected station having means acting. in response to the correcting impulses to maintain the same in synchronism with said transmitter switch, tape-controlled signal selecting means at the transmitting station, a feed-wheel for the tape, clutch members for mechanically connecting said feedwheel and said transmitter switch, and

means for disengaging said clutch members and for interrupting the transmission of signals without interrupting the transmission of the correcting impulses.

38. In a synchronous telegraph in which the signals are represented by combinations i of impulses, the combination of a rotating transmitter switch at one station for imparting the signals and correcting impulses to the line, a receiving switch mechanism at a connected station having means acting in response to. the correcting impulses to maintain the same in synchronism with said transmitter switch, tape-controlled signal selecting means at the transmitting station, a feed-wheel for the tape, clutch members for mechanically connecting said transmitter switch and feed-wheel in definite relation, a trip operative only between-complete signals for disengaging said clutch members, a tape former at the transmitting station operative independently of said transmitter switch, and means controlled by said tapeformer for shifting said trip.

39. In synchronous selectlve telegraphs in which the signals are represented by permutations of a definite number of impulses of opposite polarity, the combination of a continuously rotating transmitter switch at one station for imparting the signals and correcting impulses to the line, a continuously rotating receiver switch at a connected statlon having means acting in response to the correctingimpulses for maintaining-the same in synchronism with said transmit ter switch, a set of tape controlled olechangers at the transmitting station, a eedwheel for the tape, a rotary member for intermittently connecting the contacts of said pole-changers to the same battery terminal, clutch members for connecting said rotary member and said feed-wheel to said transmitter switch in definite timed relation, and a device actuated by the movement of the tape for controlling the engagement and disengagement of said clutch members.

40. In synchronous selective telegraphs in which the signals are represented by .permutations of a definite number of impulses of opposite polarity, the combination of a continuously rotating transmitter switch at one station for imparting the signals and correcting impulses to the line, a rotatmg receiver switch at a connected station having means acting in response to the correcting impulses for maintaining the same in synchronism with saidtransmitter sw tch, a set of tape-controlled ole-changers at the transmitting station, a eeder for the tape a tape-former operative independently 0 said transmitter'switch, means controlled by the operation of said tape-former for inter rupting the feed of the tape, and devices controlled by said interrupting means for connecting all the contacts of said polechangers to the same battery terminal.

41.- In a synchronous selective telegraph, the combination with a line circuit, of rotary transmitting and receiving switch mechanism at each of two connected stations, and means at all times under the control of the transmitter switch mechanism at each station and the receiver switch mechanism at the other station for maintaining stopping and starting said feeder.

42. In synchronous selective telegraphs in which the signals are represented by permutationsof a definite number of impulses of opposite polarity, the combination with a duplexed line circuit, of rotary transmitting and receiving switch mechanisms at each station, and means at all times under the control of said, switch mechanism for maintaining the same in synchronism, each station having a set of tape-controlled polechangers for selecting the signals, a tape feed-wheel for advancing the tape in timed relation with said transmitter switch mecha nism, tape-controlled means for interrupting the feed of the tape, and devices, controlled by said interrupting means for connecting all the contacts of said pole-changers to the same battery terminal.

43. Inselective telegraphs in which the signals are represented by combinations of impulses, the combination of transmitter switch mechanism for imparting the signals to the line, a tape-former operative independently of said switch mechanism, means for advancingthe tape in timed relation with the operation of said transmitter switch mechanism, a set of impulse select ing switches projecting into the path of the tape and arranged to be engaged and operated solely thereby, and devices controlled by the operation of saidtape-former for automatically stopping and starting the feed of the tape and the transmission of si nals.

441 In selective telegraphs in whic the signals are represented by combinations of impulses, the combination of transmitter switch mechanism for imparting the signals to theline, a tape-former operative independently of said switch mechanism, means for advancing the tape in timed relation with the operation of said transmitter switch mechanism, a set of impulse selecting switches projecting into the path of the tape and arranged to be engaged and operated solel thereby, a tape actuated switch controlled y'the operation of said tapeformer, and devices. nnder control of said switch and operative only between completed signals for automatically stopping and starting the feed of the tape and the trans mission of signals.

45. In' selective telegraphs in which the signals are represented by combinations of impulses, the combination of a transmitter switch, an independently operative tape punch", a tape gulde-way, a feed wheel for the tape, means acting when in operationto constantly rotate said feed Wheel in timed relation with the operation of said rotary transmitter switch, a set of impulse selecting switches projectin into said tape guide-way and arranged to e engaged and operated solely by the tape, a device automatically controlled by the operation of said tapeforrner for stopping and starting said feedwheel and the transmission of signals, said start and stop devices being arranged to operate only between completed signals.

46. In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination of switch mechanism for transmitting the sig nals and correcting impulses, an independently operative tape former, means for advancing the tape in timed relation with the operation of said transmitter switch mechanism, a set of signal selecting switches arranged to be engaged and operated solely by the tape, and devices automatically controlled by the operation of said tape-former for stoppingand starting the feed of the tape and the transmission of signals without interrupting the transmission of the correcting impulses, said stop and start devices being arranged to operate only between completed signals 7 In synchronous selective telegraphs in which the signals are represented by combinations of impulses, the combination of switch mechanism for transmitting the signals and correcting impulses, an independently operative tape-former,, a feed-wheel for the tape, means acting, when-in opera-' tion to constantly advance the tape in tlmed relation with said transmitter switch mechanism, a set of signal selecting switches arranged to engage and be operated by the tape, a tape-actuated switch automatically" controlled by the operation of said tapeformer, and devices controlled by said switch and operative only between completed si nals for stopping and starting said fee wheel and the transmission of si als without interruptin the transmisslon of the correcting impu ses'.

48. In synchronous selective telegraphs in which the signals are represented by combinations of impulses of opposite polarity, the combination of a closed line circuit, switch mechanism for transmitting the signals and correcting impulses over said line circuit, a tape-former, means for advancing the tape in timed relation with the operation of said transmitter switch mechanism, a set of impulse selecting switches arranged to be engaged and operated solely by the tape, and devices automatically controlled by the operation of said tape-former for stopping and starting the feed of the tape and the transmission of signals without interrupting the flow of current in said line circuit and the transmission of correcting impulses, said stop and start devices being arranged to operate only between completed signals.

49. In a selective telegraph in which the signals are represented by combinations of impulses, the combination with a set of tape controlled switches for selecting the signals, a rotary switch and a tape feed wheel, of a rotary member, means controlled thereby for interrupting the operation of said selecting switches, and start and stop mechanism for said rotary member and said tape feed wheel comprising cooperating rotary clutch members, a disengaging trip therefor operable only between completed signals, a tape former, and means under the joint control of said tape former and said tape feed wheel for controlling the opera tion of said trip.

50. In selective telegraphs in which the signals are represented by combinations of impulses, the combination of a rotary transmitter switch member, a set of tape-controlled impulse selectors, a toothed 'feed wheel arranged to engage and positively advance the tape, a common drive shaft,and mechanical connections acting, when in operation, to constantly rotate said transmitter member and said feed wheel in timed relation to impart successive signals to the line, a tape .former, and means operative only between completed signals for interrupting the feed of the tape and the transmission of signals and comprising a rotary clutch interposed in said mechanical connections and a cooperating trip therefor controlled by the operation of said tape former.

51. In a selective telegraph in which the signals are of uniform length and represented by permutations of impulses, the combination of a set of tape-controlled im pulse selectors, a rotary transmitter switch member cooperating therewith to impart the signals to the line, means for feeding the tape in timed relation with the operation of said rotary switch member, a tape former, and means operative only between complete signals for stopping and starting the feed of the tape and the transmission of signals and comprising a rotary clutch, a cooperating trip therefor and means controlled by the operation of said tape former for 'actuating said trip.

CHARLES L KRUM. HOWARD L. KRUM. 

